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I think implicitly return last variable on every script is a good idea. Sure, it might not seems resonable at first, but if you need temporary storage in your script you probably aren't beginner and should know what you are doing and what last variable refer to anyway.
As for multithreading, I dont think creating multiple instances of filter is a good idea. I think avs interfacd should provide filter thread local storage and thread-safe global storage. On filter that require linear frame access, filter should be registered as such, but avs interface should provide a way for filter to tell the core that the process that require linear access has done and the core is allowed to request next frame while this frame is still processing.
I know this is not a light work and may break compatibility, but it's how I imagine it right now.
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